| Mark Aldwinckle | 1:31.20 | 1996-03-03 | aged 10 | Age Groups |
| Mark Aldwinckle | 1:29.17 | 1997-03-01 | aged 11 | Age Groups |
| Andrew Smith | 1:24.02 | 1997-07-06 | aged 12 | Club championships |
| Greg Lasenby | 1:17.57 | 1998-03-07 | aged 12 | Herts Major League |
| Edward Burrell | 1:17.40 | 2001-10-13 | aged 12 | Speedo League Round 1 |
| Edward Burrell | 1:15.81 | 2001-11-10 | aged 12 | Speedo League Round 2 |
| Jake Robinson | 1:14.85 | 2007-03-18 | aged 12 | Age Groups Day 6 |
| Jake Robinson | 1:14.28 | 2007-03-18 | aged 12 | Age Groups Day 6 |
| Jake Robinson | 1:13.58 | 2007-05-26 | aged 12 | Stevenage Open |